c9s: Move repo to the Git repo root

[travier]

rpm-ostree will only use the repos it has defined in the manifest so it
is safe to always have to CentOS Stream repos available and makes things
easier for SCOS.

[cgwalters]

/approve
/lgtm

But that said this PR inspired me to write coreos/fedora-coreos-config#1947

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 03955a8 and 2 for PR HEAD f3b581a in total

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD bfd30ff and 1 for PR HEAD f3b581a in total

[LorbusChris]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cgwalters, LorbusChris, travier

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD b4c8be1 and 2 for PR HEAD a92bb50 in total

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 43bb018 and 1 for PR HEAD a92bb50 in total

[travier]

/test images

[openshift-ci]

@travier: all tests passed!

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